Mathematics, 29.08.2019 22:20, michelle230

Ruth has the following set of refrigerator magnets: {a, b, c, d, e}. (a) how many different three-letter strings can she form with these magnets? (b) how many different three-letter strings can she form if the middle letter must be a vowel?

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Ruth has the following set of refrigerator magnets: {a, b, c, d, e}. (a) how many different three-l...

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